i have talked to o-five about swapping exhaust. he convinced me to lose the two mufflers and go with a Y-pipe and a single xr1.
i also have a shop made x pipe. when going with a single muffler and Y-pipe, should i keep or lose the X-pipe?

also, should i get a 3' round casing, or a 4" round casing for the borla.

and if any of you guys know where to get the best deal on a an xr1 and a flowmaster Y, please let me know. thanks ahead for any help.